This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A174715 #9 Feb 21 2024 08:19:36 %S A174715 1,1,2,3,4,1,6,1,9,2,12,3,16,4,2,22,6,2,29,9,4,38,12,6,50,16,8,3,64, %T A174715 22,12,3,82,29,18,6 %N A174715 Triangle read by rows, Q*M as infinite lower triangular matrices. Q = A001935 shifted down four times by columns, M = A174712. %C A174715 Row sums = A000041, the partition numbers. %C A174715 Refer to comments in A174713. %F A174715 As an irregular triangle generated from a product Q*M of infinite lower triangular matrices: Q = A001935 in every column (except column 0), shifted down four times from the previous column. M = A174712, the diagonalized variant of A000041 (the partition numbers as the right border, and the rest zeros.) %e A174715 First few rows of the triangle = %e A174715 1; %e A174715 1; %e A174715 2; %e A174715 3; %e A174715 4, 1; %e A174715 6, 1; %e A174715 9, 2; %e A174715 12, 3; %e A174715 16, 4, 2; %e A174715 22, 6, 2; %e A174715 29, 9, 4; %e A174715 38, 12, 6; %e A174715 50, 16, 8, 3; %e A174715 64, 22, 12, 3; %e A174715 82, 29, 18, 6; %e A174715 ... %Y A174715 Cf. A174712, A174712, A174713, A174714 %K A174715 nonn,tabf,uned %O A174715 0,3 %A A174715 _Gary W. Adamson_, Mar 27 2010